Translational Tissue Engineering Center, Johns Hopkins University School of Medicine, Baltimore, Maryland.
Department of Biomedical Engineering, Johns Hopkins University School of Medicine, Baltimore, Maryland.
Tissue Eng Part A. 2019 Nov;25(21-22):1459-1469. doi: 10.1089/ten.TEA.2018.0341. Epub 2019 Jun 14.
Large craniofacial bone defects remain a clinical challenge due to their complex shapes and large volumes. Stem cell-based technologies that deliver osteogenic stem cells have shown remarkable regenerative potential but are hampered by the need for extensive manipulation before implantation. To address this, we explored the bone forming potential of the clinically relevant stromal vascular fraction (SVF) cells obtained from human lipoaspirate. SVF cells can be isolated for acute use in the operating room and contain a subpopulation of adipose-derived stromal/stem cells (ASCs) that can develop mineralized tissue. ASCs can be purified from the more heterogeneous population of SVF cells via secondary and tertiary culture on tissue culture plastic. In this study, the relative potential for using SVF cells or passaged ASCs to induce robust bone regeneration was compared. Isogenic SVF and ASCs were suspended in fibrin hydrogels and seeded in three-dimensional-printed osteoinductive scaffolds of decellularized bone matrix and polycaprolactone. both cell populations successfully mineralized the scaffold, demonstrating the robust bone formation properties of SVF. In murine critical-sized cranial defects, ASC-loaded scaffolds had greater (but not statistically significant) bone volume and bone coverage area than SVF-loaded scaffolds. However, both cell-laden interventions resulted in significantly greater bone healing than contralateral acellular controls. In conclusion, we observed substantial mineralization and robust bone regeneration in tissue-engineered bone grafts using both SVF and passaged ASCs. Impact Statement The inability to effectively regenerate bone within critical-sized craniofacial defects is a present clinical challenge and overcoming this limitation using tissue engineering strategies would significantly advance current treatment outcomes. The present study tests the feasibility of harvesting stem cells intraoperatively, combining them with three-dimensional (3D)-printed osteoinductive scaffolds and, without culturing , implanting them into the bone defect to stimulate regeneration. The data from this study demonstrated that SVF isolated from lipoaspirate and used with minimal processing could be combined with a 3D-printed bioactive material in a point-of-care approach to promote bone regeneration.
由于颅面骨缺损形状复杂、体积大,因此仍然是临床面临的挑战。基于干细胞的技术可提供成骨干细胞,具有显著的再生潜力,但由于在植入前需要进行广泛的操作而受到限制。为了解决这个问题,我们探索了从人脂肪抽吸物中获得的临床相关基质血管成分(SVF)细胞的成骨潜力。SVF 细胞可在手术室中进行急性分离使用,并且含有可形成矿化组织的脂肪来源基质/干细胞(ASC)亚群。ASC 可通过在组织培养塑料上进行二次和三次培养从更异质的 SVF 细胞群中纯化出来。在这项研究中,比较了使用 SVF 细胞或传代 ASC 来诱导强壮的骨再生的相对潜力。同源 SVF 和 ASC 悬浮在纤维蛋白水凝胶中,并接种在脱细胞骨基质和聚己内酯的三维打印成骨支架中。两种细胞群都成功地矿化了支架,证明了 SVF 的强大成骨特性。在小鼠临界颅骨缺损中,负载 ASC 的支架的骨体积和骨覆盖面积大于负载 SVF 的支架(但无统计学意义)。然而,两种细胞负载的干预措施都比对照侧的无细胞对照产生了显著更大的骨愈合。总之,我们观察到使用 SVF 和传代 ASC 的组织工程骨移植物中存在大量的矿化和强大的骨再生。
声明:无法在临界颅面骨缺损内有效再生骨是当前临床面临的挑战,而使用组织工程策略克服这一局限性将显著推进当前的治疗结果。本研究测试了术中收获干细胞的可行性,将其与三维(3D)打印成骨支架结合,并且无需培养,将其植入骨缺损中以刺激再生。本研究的数据表明,从脂肪抽吸物中分离的 SVF 并在不进行最小处理的情况下与 3D 打印的生物活性材料结合使用,可以通过一种即时护理的方法促进骨再生。
J Biomed Mater Res B Appl Biomater. 2024-9
ACS Biomater Sci Eng. 2023-12-11
Animals (Basel). 2023-9-9
Bioengineering (Basel). 2022-11-17
J Orthop Surg Res. 2022-1-21
Biomaterials. 2022-1
Cell. 2018-9-20
Tissue Eng Part B Rev. 2018-5-9
J Orthop Trauma. 2017-10
ACS Biomater Sci Eng. 2016-10-10
Sci Transl Med. 2016-6-15